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Across
  1. 5. region in space where gravity is strong
  2. 6. proposed by Georges Lemaitre
  3. 8. one of the natural sources of aerosols
  4. 10. H2O combine with another atom to form helium
  5. 11. tallest mountain on earth
  6. 12. destructive plate margins
  7. 17. earth's surface is not a static and intact structure
  8. 18. law that states galaxies recede at speeds proportional to their distances from the observer
  9. 22. variation of the spiral galaxy
  10. 23. undetectable form of matter
  11. 24. one of the tectonics plate
  12. 26. it is human-caused or anthropogenic
  13. 29. active regions
  14. 30. galactic cluster
  15. 32. gravitationally bound clusters
  16. 33. collection of stars
  17. 35. fine liquid and solid particles
  18. 36. flat, disk-shaped galaxies
  19. 38. Milky Way's nearest neighboring spiral galaxy
  20. 39. can wash out pathogens
Down
  1. 1. single supercontinent
  2. 2. imaginary path around the planets
  3. 3. clearing of forests
  4. 4. the ability to absorb and hold heat in the atmosphere
  5. 7. constructive plate margins
  6. 9. larger groups of galactic clusters
  7. 13. birthplace of the stars
  8. 14. conservative plate margins
  9. 15. or elongated galaxies
  10. 16. example of spiral galaxy
  11. 19. no distinct symmetry compared to spiral and elliptical galaxies
  12. 20. deepest trench
  13. 21. largest plate
  14. 25. proposed the continental drift theory
  15. 27. gases that contributes to greenhouse effect
  16. 28. emerged from rising molten rocks
  17. 31. large volumes of ocean water
  18. 34. transparent to incoming solar radiation
  19. 37. increase in the average global temperature
  20. 39. Have the greatest contribution to global warming